Traditionally, multi-channel I/O modules are ordered just after design freeze so that the assembly process can begin. However, with Select I/O, the signal types (AI, AO, DI, DO) can be defined much later and assigned simply by installing the appropriate signal conditioning module (SCM). This reduces the important of “design freeze” and reduces the financial and schedule impact of any late changes to the design (such as signal type or adding a device).
Adding a device late in the project or after startup is also more efficient with Select I/O and the Industrial Ethernet I/O Network. Simply wire the new device to the closest junction box, assign its signal name and add to the control logic. The device no longer needs to be placed within a controller centric hierarchy.
With the Select I/O and xStream engineering tools, it is now possible to the decouple tasks and allow two independent teams to work in parallel and then bind together with precision and efficiency later. This reduces the impact of changes during the project and potentially greatly reduces the commissioning time.
While the application code is being developed and tested by the application engineers, the field work can be done at any time after the cabinets are delivered to site and installed:
- Configure: Select I/O is scanned in the field and configured using data from the I/O list. A “test” configuration is automatically created for help in doing the functional loop checks.
- Check: With the I/O configured, a test configuration can be downloaded to a controller in the field enabling smart and non-smart field equipment to be tested and verified (automatically documenting the results)
- Connect: The I/O structure can be imported into Control Builder enabling the signals to be automatically marshalled to the application. Any conflicts or mismatches can be easily identified and corrected. The system is now ready for commissioning
With this solution, there are fewer surprises, fewer change orders, earlier commissioning of projects, and happier owner-operators.